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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2015 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#endregion
using System;
using System.Reflection;
using Google.Protobuf.Compatibility;
namespace Google.Protobuf.Reflection
{
/// <summary>
/// Accessor for single fields.
/// </summary>
internal sealed class SingleFieldAccessor : FieldAccessorBase
{
// All the work here is actually done in the constructor - it creates the appropriate delegates.
// There are various cases to consider, based on the property type (message, string/bytes, or "genuine" primitive)
// and proto2 vs proto3 for non-message types, as proto3 doesn't support "full" presence detection or default
// values.
private readonly Action<IMessage, object> setValueDelegate;
private readonly Action<IMessage> clearDelegate;
internal SingleFieldAccessor(PropertyInfo property, FieldDescriptor descriptor) : base(property, descriptor)
{
if (!property.CanWrite)
{
throw new ArgumentException("Not all required properties/methods available");
}
setValueDelegate = ReflectionUtil.CreateActionIMessageObject(property.GetSetMethod());
var clrType = property.PropertyType;
// TODO: Validate that this is a reasonable single field? (Should be a value type, a message type, or string/ByteString.)
object defaultValue =
descriptor.FieldType == FieldType.Message ? null
: clrType == typeof(string) ? ""
: clrType == typeof(ByteString) ? ByteString.Empty
: Activator.CreateInstance(clrType);
clearDelegate = message => SetValue(message, defaultValue);
}
public override void Clear(IMessage message)
{
clearDelegate(message);
}
public override void SetValue(IMessage message, object value)
{
setValueDelegate(message, value);
}
}
}
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